Centering and squaring chuck.



T. R. HELLGREN.

CENTERING AND SQUARVING CHUCK.

'APPLICATION FILED AUG.2B. 1916.

. Patented June 4, 1918.

4 SHEETS-SHEET 1.

I. R. HELIGIIEN. CENTERING AND SQUARING CHUCK.'

APPLICATION FILED Amma, IsIe. Patented June4,1918.

' T. R. HELLGREN.

vCENTEHING AND SQUARING CHUCK.

APPLICATION-v FILED AUG. 2B, 1916.

Patented June 4, 1918.

4 SHEETS-SHEET 3v.

H- HH "M "HIHIHHWHH atented June 4 4 SHEETS-SHEET 4.

APPLICATION FILEDl AUG`.28`| 1916.

T R HELLGREN CENTERING AND SQUARING CHUCK.

After the brasses have been clamped in the position above described, they may be indexed and7 held in .the proper "relation to j the cutting tool by the following mechanism: The base flange of the center post is squared and adapted to fit between ribs 46 on the main base plate 16. The basek flange 2O is slightly beveled at its edges, as shown' at 45 to fit upon corresponding bevel in the ribs '46." The'center pin 30 is securedto the supporting plate 16 and extends to the upperL 1 or outer portion of the device where it carries la pivloted lever 22. AThis `lever is pivotf l ally mounted at 35 to a swivel ring 33, which is fitted to a sleeve 32 threaded to the pin 30. The flange 31 and nut 34 vretain the sleeve in place. The lever 22 is provided with cam surfaces 23 which bear upon the upper end of the post 21.when the lever is in a right angular position as shown in Fig. 2 and force the beveledl base flange 20 into the main support base' 16. When thus' clamped in said position, it is-obvious that" the base flange 2O and the brasses which are f is obvious that the square form of the base I' position.

secured to it are rigidly held in'thedesired relation to the stroke of the'cutting tool. When thus clamped one of the four sides of the-brasses may be planed or finished. It

flange 20 permits indexing to four positions and that the four sides of the brasses may be brought linto the desired relation to the cutting tool for planing. This indexing may befaccomplished by moving the lever 22-to a position in alinement with the pin 30, where` upon the post 21 on the flange 20, with the brasses attached, may be withdrawn from between the ribs 46 and rotated to a new Springs 47, in sockets in the supporting plate 16, automatically push the flange from between the ribs.' The lever 22 will naturally fall to a pendant position and will clamp the chuck in its new position. It

rvwill be seen that'by locating and arranging the lever 22 as lshown in Fig. 1, gravity will operate to hold the saine in locking position and thereby prevent accidental unlocking 'Y of the work during planing thereof.

In order to center the brasses about the post 21, so that the finished surfaces may all be 'uniformly finished at the ldesired distance from the axisl of the bore, I have provided the following mechanism. y

Threevradially `rdisposed'pins or bars 38 are fitted to the apertures in the walls of the center post 21, and bear upon' the bore of the brasses whenpushed outwardly. They may beimoved in a radial direction by a scroll-gear 40, which meshesy with properlyv fitted teeth 39 on the lower side of thev pins 38." The lrotation of the vscrollsgear 40 will'. obviously forcethe pins 38 outwardly or" draw them inwardly depending upon the direction of rotation.v The hub of the scroll?.

L gear 40 is provided with spur gear teeth 42 which mesh with and are driven by the teeth of the small spur pinion 41. This small jpinion is preferably integral with a 49.v lBy means of this small lever, the'pinion 41 may be withdrawnfrom engagement with the gear 42. The indexing movement may then be performed. without -destroying'the centeringadjustment@ .The scroll gear 40 is held in proper relation to the pins 38 by a fianged'sleeve 43, whichis-.threaded to said gear. :A suitable block or ring 44 for retainingthe pins in place mayl be-provided, said ring'being xedto the post 21, by screws 44a.

The centering mechanism above described is :operated before the brassesareclamped between the circular plate 19 and: the base flange 20. lWhen `Said clamping is effected, thel small pointed lugs 37 engage the brasses y at one' end and assist in holding them inposition.

In the form shown in Figs. 7, 8, 9, 10, 11,

and 12, theV centering device. differsv from thatv above described. lI-n this form a conical member 51'is provided which may be pushed vertically on the Vcenter pin -30 by small pins or rods, 52, slidably attached to the lever 53. The conical member 51l is provided with T=slots 54, 'which engage the T- shaped ends of the pins 55. TheseI pins are three in number,preferably, andare radially disposed in the post 21. Anlupward movement imparted to the 'conical member 51'by the lever '53,*willobviously push Athe ends of the three pins 55.

In this form,jthe rotation of the chuck and indexing is permitted'by 'the circular I groove 56, which isi-provided with a flange 57 engaging notch'es58 inthe pins 52. y

The brasses arek obviously; centered by bearing upon 'the outeryInorder `to facilitate the indexing, or to permit rotation immediately upon the operation ofthe lever 22,small springs 47'are provided in l-bothfform's'ofthe' devi'ceffory pushing the lflange 20 'out ofthe main vsupporting base 16. yItwill'fbe s'e'enfthat said tion. It will b'er unnecessary for theopera then' be immediately rotated ltoI a new posi-" tor to withdrawv it from between the ribsl4'6.l

The use-'and loperation of my improved chuckj'has .been already largely referred' to in the above description, but'I willbriefly add the p following:

When clamping brasses'inl the. chuck',;ritl

will be necessary, of course, to placeithem'" around/the' post 21' and center them by'roincense tating the head 48 or operating the lever 53, depending on which form of centering device is used. After thus centering the brasses about the post 21, one or more open I firm-ly clamped between the circular plate 19 and the base flange 20.- 'Ihe base iiange 20 will then be placed between the ribs 46,

whereupon the brasses will be properly indexed at once with reference to the stroke of the tool. It is, of course, obvious that in first clamping the brasses in position, they must be placed with one side parallel to the stroke of the tool. The planing on the other three sides may then be performed in suocession, the indexing for each side being performed by first moving the lever 22 into alinement With the center pin 30, after which the brasses may be quickly rotated to a new position and clamped in said position by dropping the lever 22 to its right angular position. To remove the brasses, it is necessary only to loosen theY nut 25 suiciently to permit withdrawal of theopen washer27, when the brasses will be free to be removed. rI`he'hole in the plate 19 is large enough to pass over the nut 25 and the lever 22.

While I have. described my invention more or less. precisely as regards the detail of this construction, I do not wish to be limited thereto unduly as I contemplate changes in the form, proportion of parts, and the substitution of equivalents Within thescope of the appended claims.

What I claim is:

. 1. In a device ofthe character" described,

a rotary work-holding member having a,-

poly onal positioning element, a supporting mem er engageable with said element and preventing rotation of-said holding member when in engagement therewith, and means having a single movement under the control of the operatorfor moving one of said members from unlocked to locked position' with relation to the other.

2. In a device of the character described, a rotary work-holding member, having a polygonal positioning element, a supportingl member engage/able with said element and preventing rotation of said holding member when in engagement"therewith, means having a single movement under the control of the operator for moving one of said members from unlocked to locked position with relation to the other, and automatic means for disengaging said -members when unlocked Vto permit rotation of said holding member to new-positions.

3. In a device of the character described, a rotary work-holding member, having-a polygonal positioning element, a supporting member engageable with said element and preventing rotation of said holding member when in engagement therewith, means having a single movement under the control of the operator for locking said members in engagement, automatic means for disengaging said members whenunlocked to permit rotation of said holding-member to new positions, means for centering said work about vthe axis ot' rotation of said holding-member before said Work is clamped thereon, means for clamping work rigidly in place after centering, and blocking means between said clamping means and said. work removable upon the loosening of said clamping means.,

4C. In a device of the character described, a rotary work-holding member, having a polygonal positionin element, a supporting member engagea le with said element and preventing rotation of-said holding member when in engagement therewith, means having a single movement under the -control of the operator for locking .said

members in engagement, lautomatic means for disengaging said members when un-4 locked to permit rotation of said holding member to new positions, means for cen-.

5. In a device 'of the character described,

a rotary work-holding member, havin a polygonal positioning element, a supporting member engageable with said element and preventing rotation of said holding member when in engagement therewith, means having a single movement under the control of the operator for locking said members in engagement, automatic means for disengaging said members when unlocked to ,permit rotation of said holding member to new posin tions, means for centering said work about the axis of rotation of said holdino'member before said Work is clamped t iereon, a clamping nubthreade'd to a reduced portionf of said holding means, a ring encircling said holding means and transmlttinc` the pres-` sure of said nut to the work and having an `aperture permitting its removal over said nut, and a blockingelement open on one side and transmitting pressure fromsaid nut to said ring.

6.' In a device of the character described, a rotary Work-holding member, having a polygonal positioning element, a supporting member engagea'ble with said element and preventingrotation of said holding member when in engagement therewith, means havinga single movement under the control of the operator `for locking said members in engagement, automaticmeans for disengagmg sald members when unf locked to permit rotation of said holding pressure from said nut to said ring, said.

member to new positions, means lfor center- `ing said Work about the axis of rotation of said holding member before said Work is clamped thereon, a clamping nut threaded to a reduced portion of said. holding means,

aring encircling s-aid holding means and transmitting the pressure of said nut to the Work and having an aperture permitting its removal over said nut, and a blocking element open von lone side and transmitting locking means comprising a clamping lever movable to aposition in alinement with the aXis of'saidholding member and permitting said ring to be removed over said lever.

7. In a device of the character described, a rotary Work-holding member having a polygonal positioning element, a'supporting member engageable With said element to prevent rotation of said holding member, a

center lpin carried by said supporting member upon which said holding member lis rotatably and slidably mounted, a `lever pivotally attached to said pin and bearing upon said holding member when in operative po- .,sition to maintain "engagement of said hold ing and supporting members, and means for disengaging said members when said .lever is moved to its inoperative position.y

8. In adevice of the character described, a rotary Work-holding :member having a polygonal positioning element, a supporting `member engageable -With said element to prevent rotation of said holding member, a center pin carried by said supporting member upon which said holding member is rotatably and slidably mounted, a lever pivotally attached to said pin and bearing lupon saidholding member when in operative positionto maintain engagement of said holding and supporting members, means for disengaglng said ,members When said lever isl moved to its inoperative position, said holding memberhaving a reduced threaded portion to receive a clamping nut, and blocking means between said nut and the Work Copies of this patent may be obtained'for Lacasse having an aperture permitting it to be removed over said nut'and said lever.

- 9A4 In a device ofthe character described,

a rotary werk-holding member having a polygonal positioningelement, a supporting member engagcable with said element topreventrotatlon of said holding member, and means held by gravity 1n lockingposition operable to move one of'said members into said holding member being rotatably and slidably attached to said supporting member, means pivotally attached to said supporting member and held by gravity in position to lock said members in engagement, and means for disengaging said members When said last-named meansis raised from its locking position. 12. In a device of the character described, a rotary Work-holding member having a polygonal positioning element, a supporting member engageable with said element to-prevent rotation of said holding member, means l Y held by gravity in position to locksaid members in engagement, and means for disengaging said members When said ylast-named means is raised from its locking position.

' In testimony- Whereof,-I have subscribed mynama.

y TOBIAS R. HELLGREN. Y

Witnesses:

J. A. CARNEY,

W. W. Konturen.

rive cents each; by addressing the Commissioner o! Patenti, Weshtngtornnc. v 

